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The title compound, C 11 H 13 N 2 O, was obtained by cyclo­condensation of 2-amino­pyridine-3-carbonitrile with cyclo­penta­none. The mol­ecule is built up from two fused six-membered rings and one five-membered ring linked through a spiro C atom. Both the pyrimidine and the cyclo­pentane rings adopt envelope conformations. In the crystal structure, mol­ecules are linked by inter­molecular N—H⋯O hydrogen bonds.

Spiro[cyclopentane-1,2′(1′H)-pyrido[2,3-d]pyrimidin]-4′(3′H)-one